That really brings back memories. That sound means all the phonecalls, parking and standing line is over and you get to actually watch a movie as it was meant to be seen.
The engineering of the "noise" also had a practical purpose. It sweeps by most every frequency, including the entire vocal range. So it was impossible to continue any conversation without noticing that the movie was about to start. The seconds after that sound were always the most quiet of the entire evening.
You mean you get to watch a bunch of forced ads with the volume turned up to eleven and get told what a horrible criminal you are and then maybe you get to see the movie if your ears are still functional.
The engineering of the "noise" also had a practical purpose. It sweeps by most every frequency, including the entire vocal range. So it was impossible to continue any conversation without noticing that the movie was about to start. The seconds after that sound were always the most quiet of the entire evening.